Mr B

So what data you put in on the R box casing to make accurate results on deflection ? Your results at 65/75hp seem high to me and at even standard hp of around 250-300 you would cracking end housings . Like I say par not only ones do it with standard final drive, lot of ppg straight cut kits been used in R's and bluebirds and others models Inc evo . Best box is always going be adding new sc final drive .

Mr B

@PartyPete wrote:I did have the stratcher motor sport end brace fitted Neil, mr b what sort of power were you running through those boxes?

No I have home made resin and steel plate on end case nose similar to what done in Malaysia Russia and Australia about decade ago for improving the 50A casing .Ones at 390ft lb and 460ft lb , both retain OEM final drive. Have a drag one in Malaysia in 500s but that has custom ratio sc final drive which is wise .

Cosmic73

Posts : 1093Join date : 2015-10-04Age : 45Location : County Durham

so taking a step back these are the facts as i see it so far;

1, Pete's gears were all fine as he went through 1st, 2nd and then 3rd,2, Pete had been in 3rd and was reaching the redline (peak torque) when it went bang,3, Pete could disengage 3rd (rules out the possibility that the 1st gear synchro had moved leftwards/self engaged. This would have locked select in 3rd/4th,4. 1st gear synchros teeth have sheared.5, No parts were missing from the gearbox build, 6, All Pete's detent balls, shifter shaft grooves and springs were in OK condition, rules out slop in the seletor mech.7, If the 1st gear synchro didn't move leftwards then the mainshaft must have moved rightwards into the synchro??8, Pete's box was braced. I assume tightly clamped which rules out excessive case deflections,9a Conclusion, Pete's box had excessive mainshaft clearance9b Conclusion, Pete's box did not have the brace securely fitted,

That's all ive got for now,Hopefully we'll know more when the mainshaft is stripped on Friday.

Mr B

@PartyPete wrote:Oh....and I'd rather shit in my hands and clap than buy another Evo

Gearbox in evo is virtually identical in base layout and hollow shaft transfer. Casing stronger but still got add decent gear kit if got punchy400+HP a good clutch and drive it hard, I had 2 box builds on my evo and a rear diff, my pulsar standard box took good 320ft lb for years and is bagged on a pallet as a spare as went par on a salvaged box to save trashing known decent low mileage box dragging it .I sold my evo to import a second JDM R as they way better lol ... they like Marmite - love or hate :-)

PartyPete

the one star club

Posts : 1935Join date : 2014-01-27Age : 32Location : Derbyshire

If other people's boxes can run more power happily with the standard final drive then there's no reason mine shouldn't surely? I don't think I'll be spending another £500 or so for the straight cut final drive, I promised myself I wouldn't throw any more money at it. See what happenes once the gears are off, rebuild it to within the tolerances and Neil's expertise and see what happens, as much as I hate to say it but if it goes again then I shall be getting shut. I've had enough of gearbox issues, that's all I've had with this car (and tbf the last one). Fingers crossed it gets rebuilt and it lasts a long time and I can continue with it.

Mr B

^^ What torque yours atGearboxes are always an issue for manual transverse 4wd once kicking out punchy torque & got lots of grip & competitive driver .Hard to know when stop spending but also sometimes it worth little extra cost & the R is pretty cheap to get good power and reliability. If you want best chance of not touching box for few years then get sc shaft and ring gear and build it up with new synchro parts as needed and new bearings. Selling up is always a big loss and any other project car will have it's money pot issues . You been unlucky with box and think most of it has to be build issue . My drag R will be getting more power and custom ratio gears which will be including sc shaft and ring gear as not overly expensive and best affordable route for transmission that can probably handle over 500ft lb torque and drive you home after bit of fun at the strip. If you can afford throw in an extra 500 then go for it & get your money back in amusement of spanking big money evos on the track with absolute no fear and driving home not on a trailer lol . You put loads of effort in this R and really seem love the car so would love see positive future posts of track fun and fine tuning rather than a sale thread . Good luck Mr PARtyPete, they say 3rd time lucky but this one will your lucky perfection I hope whether oem or sc fd .

PartyPete

the one star club

Posts : 1935Join date : 2014-01-27Age : 32Location : Derbyshire

It's at 420lb,I know what you're saying B but add that 'little extra cost' onto the litteraly thousands upon thousands I've all ready spent just on the gearbox alone, then the thousands I've spent on the rest of the car, to have a car that in the last 2 years I've owned it had it actually on the road for probably less than 4/5 weeks in total it's just doesn't make sense any more, I'm trying to save money, and I don't exactly have a lot of it. I'm not being a little bitch here but seriously....I'm fed up of it. The only thing that's kept me going is every time I look at it I just think it looks bad ass....and the only car if have is an r32...which atm I can't afford. All I wanna do is drive it and enjoy it, but I can't. I don't want to chuck another £500 odd into it incase it fucks up again.

Mr B

^ Yeh I get you your situation Pete, most would of cried long ago and sold out, maybe we could have a PARtyPete final box build fundraiser raffle. Prize item donated by someone and £5 a ticket . I'd be happy buy couple if means an R on track pissing evo's off. Perhaps we could even supply some good order used parts if you made a list meaning more funds for best build possible . You put shit loads sweat money and aspirin into this and it is indeed pretty bad-ass, sure evo drivers stain their recaros when you hassling them lol.See what feedback you get from par as indeed standard fd should do you but sc would be good and allow more tuning potential and less worry lol .

johnny gtir

I won't mention my 427 bhp and lots of torque can not remember the figure running on a standard box and it been ok. Give it this last chance. Prob sounds stupid but car should of been 350-380 bit less torque on box and enjoyed mate

PartyPete

the one star club

Posts : 1935Join date : 2014-01-27Age : 32Location : Derbyshire

Sorry Johnny but I don't do 'less power' if you want to swear take it some where else....you northerners

That's a great idea mr b but I don't want to be the club peasant scrounging parts (with all respect). People have there own problems without trying to help me out. Just spoken to some one who had the 1st to 5th par straight cut set with the straight cut fd and his shattered after less than 200 miles, he says it was poor materials used. My head is in a muddle with all this.

Cosmic73

Posts : 1093Join date : 2015-10-04Age : 45Location : County Durham

I agree you should be able to run these gears on stock final drive gears but with a braced casing to resist the much higher deflections.Dont worry mate, eventually we'll establish beyond doubt what the root cause was, then we can rebuild with more confidence.Once the shaft assembly is split this Friday we'll be able to measure the entire shift mechanism and compare against spec.Mr B is right; rebuild it one last time but leave absolutly nothing to chance.

shroom

It was probably that previous owner launching it out of McDonnalds all the time trashing the box at 360bhp that did it. I am sure he used to be on here

Yeah I think those two northerners are getting a bit too friendly with their shafts and drain holes.

You need to keep going Pete, no matter how bad my car gets I just have to pop on here and read your woes, you make me feel much better you are like a healing GTiR priest always there to make us feel better.

shroom

Posts : 1686Join date : 2015-01-02Age : 27Location : on a sheep

Also why dont you sell your sissy ass honda and put the money into your R. You could probably pick up another shed of a primera and make your R even better. Surely 500bhp cant be that far away christ Johnny has your power on a stock box

GTI-R US

We built up a stock box which was then fitted to Svens Dutch car which made 510bhp.That is still going strong so guess it really is luck of the draw with old boxes, but it does help hugely if they are assembled correctly........unlike some that have been built for us in the past by a so called expert on a certain forum.

Neil (never met him) but seems like a very knowledgable chap who will pay attention to detail so think I would trust in him getting this right for you where as the other guy who lashed up the build obviously never had a clue with clearances or just couldn't be bothered to take the time to make sure everything was correct when assembling the thing.

_________________GTI-R-US.co.ukIn association withTorque Of The South Motorsport